nfs4getroot.c

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
 4* Written by David Howells (dhowells@redhat.com)
 5*/
 6
 7#include <linux/nfs_fs.h>
 8#include "nfs4_fs.h"
 9#include "internal.h"
10
11#define NFSDBG_FACILITY		NFSDBG_CLIENT
12
13int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool auth_probe)
14{
15	struct nfs_fattr *fattr = nfs_alloc_fattr();
16	int ret = -ENOMEM;
17
18	if (fattr == NULL)
19		goto out;
20
21	/* Start by getting the root filehandle from the server */
22	ret = nfs4_proc_get_rootfh(server, mntfh, fattr, auth_probe);
23	if (ret < 0) {
24		dprintk("nfs4_get_rootfh: getroot error = %d\n", -ret);
25		goto out;
26	}
27
28	if (!(fattr->valid & NFS_ATTR_FATTR_TYPE) || !S_ISDIR(fattr->mode)) {
29		printk(KERN_ERR "nfs4_get_rootfh:"
30		       " getroot encountered non-directory\n");
31		ret = -ENOTDIR;
32		goto out;
33	}
34
35	memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
36out:
37	nfs_free_fattr(fattr);
38	return ret;
39}